Cover plate structure, single battery and battery pack

Abstract

The utility model relates to a cover plate structure, single battery and battery pack, the cover plate structure comprises a cover plate, a metal pole and a metal compression ring, the cover plate is provided with a mounting hole, the metal pole comprises a limit part and a columnar part which are connected with each other, the metal pole is mounted in the mounting hole through the welding of the columnar part and the inner side wall of the metal compression ring, and the metal compression ring is fixed on the limit part. A through hole is formed in the columnar portion of the metal pole, a groove surrounding the columnar portion is formed in the face, away from the cover plate, of the metal pressing ring, and the metal pressing ring is welded to the end, away from the limiting portion, of the columnar portion on the bottom wall of the groove. According to the cover plate structure, the metal pole and the switching piece can be conveniently welded from the outside of the battery through the through hole, the assembly process is relatively simple, after the pole and the switching piece are welded, the sealing aluminum sheet is additionally welded through the groove of the metal pressing ring, and compared with a traditional condition that a welding seam is located in a mounting hole, the sealing aluminum sheet is welded to the groove of the metal pressing ring; the sealing effect can be further improved relatively, and the liquid leakage problem is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover plate structure, a single cell and a battery pack. Background Art

[0002] The existing square single battery usually includes a shell, a cover plate and a battery cell. The cover plate is provided with a pole, and the pole lug of the battery cell is charged and discharged through the pole. The process of installing the pole on the cover plate currently mainly includes riveting, injection molding, welding, and minimalist pole.

[0003] CN116780061A discloses a top cover assembly and a battery, comprising a top cover sheet, a pole, an upper injection molded part, a lower insulating part, a sealing part and a metal part, wherein the top cover sheet, the upper injection molded part, the lower insulating part, the sealing part and the metal part are all provided with mounting holes penetrating through the thickness direction thereof, the pole is passed through the mounting hole, the upper injection molded part is arranged between the metal part and the top cover sheet, the lower insulating part is arranged on a side of the top cover sheet away from the upper injection molded part, the pole is welded to the metal part; the sealing part is arranged between the top cover sheet and the pole, and the sealing part is interference fit with the top cover sheet. The pole is welded to the metal part, and the connection strength between the metal part and the pole is increased. When the battery is assembled into a module, the metal part is connected to the pole by welding, which can prevent torsion and enhance the strength of the top cover assembly. The seal is arranged between the top cover sheet and the pole, and the seal has an interference fit with the top cover sheet, which plays a sealing role, improves the sealing of the top cover assembly, and prevents battery leakage. However, the above-mentioned sealing method of using the pole and the metal part to form a weld is, on the one hand, of great importance to the sealing of the battery. Since the weld is usually located above the mounting hole of the cover plate, leakage may occur when there are defects in the weld. On the other hand, in the process of welding the cover plate to the adapter plate of the pole ear, it is necessary to weld from the inside of the battery cell, and there is a problem of repeatedly folding the cover plate, and the production process is relatively complicated. Utility Model Content

[0004] Based on this, it is necessary to provide a cover plate structure, a single cell and a battery pack that can weld the adapter and the pole from the outside of the battery, has a relatively simple production process and can overcome the problem of weld leakage.

[0005] In the first aspect, the present application provides a cover plate structure, including a cover plate, a metal pole and a metal pressure ring, wherein the cover plate is provided with a mounting hole, the metal pole includes a limiting portion and a columnar portion connected to each other, the metal pole is installed in the mounting hole by welding the columnar portion and the inner side wall of the metal pressure ring, a through hole is provided on the columnar portion of the metal pole, the metal pressure ring is provided with a groove surrounding the columnar portion on a side away from the cover plate, and the metal pressure ring is welded to the bottom wall of the groove and the end of the columnar portion away from the limiting portion.

[0006] In one embodiment, the mounting hole has a rectangular cross section, and the columnar portion has a rectangular cross section.

[0007] In one embodiment, the through hole has a rectangular cross-section.

[0008] In one embodiment, the bottom wall of the groove is flush with the end of the columnar portion away from the limiting portion;

[0009] Alternatively, the bottom wall of the groove is within 0.25 mm higher or lower than the end of the columnar portion away from the limiting portion.

[0010] In one embodiment, the cover structure also includes a lower plastic, a sealing ring and an upper plastic, the cover has a first surface and a second surface opposite to each other, the sealing ring is placed outside the columnar portion and is pressed tightly between the limiting portion and the first surface of the cover, the lower plastic is provided with a first through hole, the upper plastic is provided with a second through hole, the first through hole of the lower plastic is placed outside the columnar portion, and the lower plastic is pressed tightly between the limiting portion and the first surface of the cover, the sealing ring is located in the first through hole, the second through hole of the upper plastic is placed outside the columnar portion, and the metal pressure ring presses the upper plastic against the second surface of the cover.

[0011] In one embodiment, the cover plate is provided with a mounting groove on the first surface, and the cover plate is provided with a mounting hole penetrating the cover plate on the bottom wall of the mounting groove. The sealing ring is located in the mounting groove, and the sealing ring is pressed tightly between the limiting portion and the groove wall of the cover plate in the mounting groove.

[0012] In one embodiment, the lower plastic has a limiting groove, and the limiting groove is convexly provided on the other side of the lower plastic to form a limiting protrusion, the limiting protrusion is accommodated in the installation groove, and the bottom wall of the limiting groove is provided with a first through hole penetrating the limiting protrusion; the limiting part is installed in the limiting groove.

[0013] In one embodiment, the limiting groove has a rectangular cross section, and the limiting portion has a rectangular sheet structure;

[0014] And / or, the width of the through hole gradually increases from the columnar portion toward the limiting portion;

[0015] And / or, the width of the inner hole of the metal pressure ring gradually increases from the columnar portion toward the limiting portion;

[0016] And / or, the inner hole of the metal pressure ring has a rectangular cross section.

[0017] In a second aspect, the present application provides a single cell, comprising a cover plate structure as described in any of the above embodiments, wherein a sealing aluminum sheet is welded to the side wall of the groove of the metal pressure ring.

[0018] In a third aspect, the present application provides a battery pack comprising a single cell as described in any of the above embodiments.

[0019] The above-mentioned cover plate structure is provided with a perforation on the columnar portion of the metal pole, so that it is convenient to weld the metal pole and the adapter through the perforation from the outside of the battery, that is, from the side of the cover plate away from the shell, so that the assembly process of the battery can be relatively simple. A groove surrounding the columnar portion is provided on the side of the metal pressure ring away from the cover plate, and the metal pressure ring is welded to the bottom wall of the groove and the end of the columnar portion away from the limiting portion. After the pole and the adapter are welded, a sealing aluminum sheet is added through the groove of the metal pressure ring. Compared with the situation where the traditional weld is in the mounting hole, the sealing aluminum sheet is welded to the groove of the metal pressure ring, which can further improve the sealing effect and reduce the leakage problem. In addition, the sealing aluminum sheet can better seal the potential leakage hazard of the perforation on the metal pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a cover plate structure according to an embodiment;

[0021] Figure 2 An exploded view of a cover plate structure according to an embodiment;

[0022] Figure 3 This is a schematic structural diagram of a cover plate structure according to an embodiment;

[0023] Figure 4 for Figure 3 Partial cross-section along line AA;

[0024] Illustrations: 100 - cover plate, 110 - mounting hole, 120 - mounting groove, 200 - metal pole, 210 - limiting portion, 220 - columnar portion, 221 - through hole, 300 - metal pressure ring, 310 - groove, 320 - inner hole, 400 - lower plastic, 410 - first through hole, 420 - limiting groove, 421 - limiting protrusion, 500 - sealing ring, 600 - upper plastic, 610 - placement groove, 620 - second through hole, 630 - extension portion. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present application, in order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application, and the preferred implementation methods of the present application are given in the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the implementation methods described herein. On the contrary, the purpose of providing these implementation methods is to make the disclosure of the present application more thoroughly and comprehensively understood. The present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited to the specific embodiments disclosed below. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined. It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application. The terms used herein are only for the purpose of describing specific implementation methods and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] In the first aspect, the present application provides a cover plate structure, see Figures 1 to 4The cover plate structure includes a cover plate 100, a metal pole 200 and a metal pressure ring 300. The cover plate 100 is provided with a mounting hole 110, and the mounting hole 110 is used to install the metal pole 200. The metal pole 200 includes a limiting portion 210 and a columnar portion 220 connected to each other. The limiting portion is used to limit one end of the pole, so that the pole can be easily installed on the mounting hole of the cover plate. The columnar portion is used to pass through the mounting hole. The metal pole 200 is installed in the mounting hole 110 by welding the columnar portion 220 to the inner side wall of the metal pressure ring 300. A through hole 221 is provided on the columnar portion 220 of the metal pole 200. The through hole 221 is used to facilitate the subsequent welding of the adapter or the pole ear through the side of the cover plate away from the internal winding core of the battery. The metal pressing ring 300 is provided with a groove 310 surrounding the columnar portion 220 on a side away from the cover plate 100, and the metal pressing ring 300 is welded at the bottom wall of the groove 310 and the end of the columnar portion 220 away from the limiting portion 210. In the present application, by providing the groove 310 on the metal pressing ring, after welding the metal pole 200 with the adapter or the pole ear through the through hole 221, a sealing aluminum sheet can be welded and installed on the groove 310, and the sealing aluminum sheet is used to seal and block the groove 310 of the metal pressing ring 300.

[0027] The above-mentioned cover plate structure is provided with a perforation 221 on the columnar portion 220 of the metal pole 200. In this way, it is convenient to weld the metal pole 200 and the adapter through the perforation 221 from the outside of the battery, that is, the side of the cover plate 100 away from the shell, so that the assembly process of the battery can be relatively simple. The metal pressure ring 300 is provided with a groove 310 surrounding the columnar portion 220 on the side away from the cover plate 100. The metal pressure ring 300 is welded to the bottom wall of the groove 310 and the end of the columnar portion 220 away from the limiting portion 210. After the pole 200 and the adapter are welded, a sealing aluminum sheet is welded and installed through the groove 310 of the metal pressure ring 300. Compared with the situation where the traditional weld is in the mounting hole, the sealing aluminum sheet welded to the groove of the metal pressure ring can further improve the sealing effect and reduce the leakage problem. In addition, the sealing aluminum sheet can better seal the potential leakage hazard of the perforation on the metal pole.

[0028] In one embodiment, the mounting hole 110 has a rectangular cross section, and the columnar portion 220 has a rectangular cross section. In this way, the mounting hole and columnar portion with a rectangular cross section can further improve the torsion of the pole compared to the conventional circular mounting hole. In addition, with the welding of the metal pressure ring of the present application, the rotational torsion of the pole and the anti-drop mechanical properties of the pole of the present application are significantly enhanced.

[0029] In one embodiment, the perforation 221 has a rectangular cross section. In this way, the perforation 221 with a rectangular cross section matches the shape of the adapter. Of course, when matching the rectangular perforation 221 of this embodiment, a relatively thick adapter, that is, a thickness of 1.5-2 mm or more, is used to facilitate the subsequent welding of the end of the adapter and the side wall of the perforation. For example, a hard-connected adapter is used.

[0030] In one embodiment, the bottom wall of the groove 310 is flush with the end of the columnar portion 220 away from the limiting portion 210; or, the bottom wall of the groove 310 is within 0.25 mm higher or lower than the end of the columnar portion 220 away from the limiting portion 210. In other words, it is convenient and easier to weld when the bottom wall of the groove 310 of the metal pressure ring 300 is flush with the end of the columnar portion 220. Of course, when the end of the columnar portion 220 extends or shrinks within 0.25 mm relative to the bottom wall of the groove 310 of the metal pressure ring 300, the weld can be well welded under the existing welding process. Moreover, compared with the method of welding on the side wall of the inner hole 320 of the metal pressure ring 300, by completing the welding on the side wall, the thickness of the entire cover plate plus the metal pressure ring can be relatively reduced.

[0031] In one embodiment, the cover structure further includes a lower plastic 400, a sealing ring 500 and an upper plastic 600, and the cover 100 has a first surface and a second surface opposite to each other, wherein the first surface of the cover 100 is located on a side close to the battery cell inside the battery when in use, and the second surface of the cover is located on a side away from the battery cell inside the battery when in use. The sealing ring 500 is sleeved outside the columnar portion 220 and is pressed tightly between the limiting portion 210 and the first surface of the cover 100, which can press and compress the sealing ring, and can better seal the installation of the pole. The lower plastic 400 is provided with a first through hole 410, and the upper plastic 600 is provided with a second through hole 620. The first through hole 410 of the lower plastic 400 is sleeved outside the columnar portion 220, and the lower plastic 400 is pressed tightly between the limiting portion 210 and the first surface of the cover plate 100. The sealing ring 500 is located in the first through hole 410, and the second through hole 620 of the upper plastic 600 is sleeved outside the columnar portion. The metal pressing ring 300 presses the upper plastic 600 against the second surface of the cover plate 100. In this way, by using the upper and lower plastics 400, the sealing ring 500 and the upper plastic 600, the installation of the metal pole can be better sealed and insulated. For example, the upper plastic 600 extends from the side wall of the second through hole 620 toward the sealing ring to form an extension portion 630, and the extension portion 630 extends into the mounting hole 110 and is located between the side wall of the mounting hole 110 and the columnar portion 220. For example, the upper plastic 600 also has a placement groove 610 on the side away from the cover plate, and the metal pressure ring 300 is partially accommodated in the placement groove 610.

[0032] In one embodiment, the cover plate is provided with a mounting groove 120 on the first surface, and the cover plate is provided with a mounting hole 110 penetrating the cover plate 100 on the bottom wall of the mounting groove 120. The sealing ring 500 is located in the mounting groove 120, and the sealing ring 500 is pressed tightly between the limiting portion 210 and the groove wall of the cover plate 100 in the mounting groove 120.

[0033] In one embodiment, the lower plastic 400 has a limiting groove 420, and the limiting groove 420 is convexly provided on the other side of the lower plastic 400 to form a limiting protrusion 421, and the limiting protrusion 421 is accommodated in the mounting groove 120, and the bottom wall of the limiting groove 420 is provided with a first through hole 410 penetrating the limiting protrusion 421; the limiting portion 210 is installed in the limiting groove 420. For example, the limiting groove 420 has a rectangular cross section, and the limiting portion 210 presents a rectangular sheet structure; in this way, the anti-twisting performance of the pole can be further enhanced.

[0034] In one embodiment, see Figure 4 and Figure 2 For example, the inner hole 320 of the metal pressure ring 300 has a rectangular cross section. For example, the columnar portion 220 has a rectangular cross section. For example, the width of the inner hole 320 of the metal pressure ring 300 gradually increases from the direction of the columnar portion 220 approaching the limiting portion 210; for example, the width of the columnar portion gradually increases from the direction of the columnar portion 220 approaching the limiting portion 210; in this way, it can play a better guiding and tightening role in the cooperation between the columnar portion and the inner hole of the metal pressure ring. For example, the width of the perforation 211 gradually increases from the direction of the columnar portion 220 approaching the limiting portion 210; in this way, it can play a better guiding and tightening role when cooperating with a rectangular sheet-shaped adapter.

[0035] The above-mentioned cover plate structure is provided with a perforation 221 on the columnar portion 220 of the metal pole 200. In this way, it is convenient to weld the metal pole 200 and the adapter through the perforation 221 from the outside of the battery, that is, the side of the cover plate 100 away from the shell, so that the assembly process of the battery can be relatively simple. The metal pressure ring 300 is provided with a groove 310 surrounding the columnar portion 220 on the side away from the cover plate 100. The metal pressure ring 300 is welded to the bottom wall of the groove 310 and the end of the columnar portion 220 away from the limiting portion 210. After the pole 200 and the adapter are welded, a sealing aluminum sheet is welded and installed through the groove 310 of the metal pressure ring 300. Compared with the situation where the traditional weld is in the mounting hole, the sealing aluminum sheet welded to the groove of the metal pressure ring can further improve the sealing effect and reduce the leakage problem. In addition, the sealing aluminum sheet can better seal the potential leakage hazard of the perforation on the metal pole.

[0036] In the second aspect, the present application provides a single cell, including a cover plate structure as described in any of the above embodiments, wherein a sealing aluminum sheet is welded in the side wall of the groove of the metal pressure ring. For example, only one pole can be installed on the cover plate, which is suitable for a battery structure with two cover plates and pole ears at both ends. Of course, two poles can also be set on one cover plate, which are positive poles or negative poles.

[0037] In a third aspect, the present application provides a battery pack comprising a single cell as described in any of the above embodiments.

[0038] In the above-mentioned single cell battery pack, due to the use of the above-mentioned cover plate structure, a through hole is provided on the columnar portion of the metal pole, so that it is convenient to weld the metal pole and the adapter through the through hole from the outside of the battery, that is, from the side of the cover plate away from the shell, so that the assembly process of the battery can be relatively simple. A groove surrounding the columnar portion is provided on the side of the metal pressure ring away from the cover plate, and the metal pressure ring is welded to the bottom wall of the groove and the end of the columnar portion away from the limiting portion. After the pole and the adapter are welded, a sealing aluminum sheet is added through the groove welding of the metal pressure ring. Compared with the situation where the traditional weld is in the mounting hole, the sealing aluminum sheet is welded to the groove of the metal pressure ring, which can further improve the sealing effect and reduce the leakage problem. In addition, the sealing aluminum sheet can better seal the potential leakage hazard of the through hole on the metal pole.

[0039] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. It should be noted that "in one embodiment", "for example", "for example", etc. in this application are intended to illustrate the present application, rather than to limit the present application. The above-described embodiments only express several implementation methods of the present application, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the patent application. It should be pointed out that for a person of ordinary skill in the art, without departing from the concept of the present application, several variations and improvements can also be made, which all belong to the scope of protection of the present application. Therefore, the scope of protection of the patent in this application shall be subject to the attached claims.

Claims

1. A cover plate structure, comprising a cover plate, a metal pole and a metal pressure ring, wherein a mounting hole is provided on the cover plate, the metal pole comprises a limit portion and a columnar portion connected to each other, the metal pole is mounted in the mounting hole by welding the columnar portion and the inner side wall of the metal pressure ring, characterized in that: The columnar portion of the metal pole is provided with a through hole, the metal pressure ring is provided with a groove surrounding the columnar portion on a side away from the cover plate, and the metal pressure ring is welded to the bottom wall of the groove and the end of the columnar portion away from the limiting portion.

2. The cover plate structure according to claim 1, characterized in that: The mounting hole has a rectangular cross section, and the columnar portion has a rectangular cross section.

3. The cover plate structure according to claim 2, characterized in that: The perforations have a rectangular cross-section.

4. The cover plate structure according to claim 1, characterized in that: The bottom wall of the groove is flush with the end of the columnar portion away from the limiting portion; And / or, the bottom wall of the groove is within 0.25 mm higher or lower than the end of the columnar portion away from the limiting portion.

5. The cover plate structure according to claim 1, characterized in that: The cover plate structure also includes a lower plastic, a sealing ring and an upper plastic. The cover plate has a first surface and a second surface opposite to each other. The sealing ring is placed outside the columnar portion and is pressed tightly between the limiting portion and the first surface of the cover plate. The lower plastic is provided with a first through hole, and the upper plastic is provided with a second through hole. The first through hole of the lower plastic is placed outside the columnar portion, and the lower plastic is pressed tightly between the limiting portion and the first surface of the cover plate. The sealing ring is located in the first through hole, and the second through hole of the upper plastic is placed outside the columnar portion. The metal pressure ring presses the upper plastic against the second surface of the cover plate.

6. The cover plate structure according to claim 5, characterized in that: The cover plate is provided with a mounting groove on the first surface, and a mounting hole penetrating the cover plate is provided on the bottom wall of the mounting groove. The sealing ring is located in the mounting groove, and the sealing ring is pressed tightly between the limiting portion and the groove wall of the cover plate in the mounting groove.

7. The cover plate structure according to claim 6, characterized in that: The lower plastic has a limiting groove, and the limiting groove is convexly arranged on the other side of the lower plastic to form a limiting protrusion, the limiting protrusion is accommodated in the installation groove, and the bottom wall of the limiting groove is provided with a first through hole penetrating the limiting protrusion; the limiting part is installed in the limiting groove.

8. The cover plate structure according to claim 7, characterized in that: The limiting groove has a rectangular cross section, and the limiting portion presents a rectangular sheet structure; And / or, the width of the through hole gradually increases from the columnar portion toward the limiting portion; And / or, the width of the inner hole of the metal pressure ring gradually increases from the columnar portion toward the limiting portion; And / or, the inner hole of the metal pressure ring has a rectangular cross section.

9. A single cell battery, characterized in that: It comprises the cover plate structure as described in any one of claims 1 to 8, wherein a sealing aluminum sheet is welded in the side wall of the groove of the metal pressure ring.

10. A battery pack, characterized in that: Comprising a single cell as claimed in claim 9.

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